[wp-trac] [WordPress Trac] #31720: Emoji email filter doesn't check the content type

[WordPress Trac]

#31720: Emoji email filter doesn't check the content type
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 Reporter:  pento         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.2
Component:  Mail          |    Version:  trunk
 Severity:  normal        |   Keywords:  emoji
  Focuses:                |
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 The emoji email filter needs to check the content type of the email, and
 only transform emoji into images if it's `text/html`.

 We need to check both `$mail['headers']` and the result of the
 `wp_mail_content_type` filter.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31720>
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